diff --git a/src/main/java/com/github/yufiriamazenta/craftorithm/recipe/registry/RecipeRegistry.java b/src/main/java/com/github/yufiriamazenta/craftorithm/recipe/registry/RecipeRegistry.java
index 4119433d..c132fc6d 100644
--- a/src/main/java/com/github/yufiriamazenta/craftorithm/recipe/registry/RecipeRegistry.java
+++ b/src/main/java/com/github/yufiriamazenta/craftorithm/recipe/registry/RecipeRegistry.java
@@ -35,7 +35,7 @@ public RecipeRegistry setResult(ItemStack result) {
         return this;
     }
 
-    @Nullable
+    @NotNull
     public String group() {
         return group;
     }